Support Calendar synching and internet use

Thread Starter

If I set up the default calendar with a gmail account, then disable calendar autosynching, will my Galaxy never again try to authenticate, or even communicate with a server when I am trying to use the calendar?

It probably won't unless you sync it manually. Why would you turn off calendar sync? Unlike mail, calendar and contacts are synced roughly once a day - so there's no battery gain in turning these off, and they consume little data as well.